DB migration bug in 1.8.3 when creating ManyToMany relation.

[Chen]

Hi,
I am using python version 3.4 and django 1.8.3, I have the following very simple code:

from django.contrib.auth.models import User

class Agent(models.Model):

name = models.CharField(max_length=100)
users = models.ManyToManyField(User, related_name='accessible_agents', default=[])

and when I have an empty database, and do python manage.py migrate.

It gives me error, and I tested on 1.7.8, it works fine.

Operations to perform:

Synchronize unmigrated apps: staticfiles, download, messages
Apply all migrations: admin, auth, contenttypes, sessions

Synchronizing apps without migrations:

Creating tables...

Creating table download_agent
Running deferred SQL...

Traceback (most recent call last):

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/backends/utils.py", line 62, in execute

return self.cursor.execute(sql)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/backends/mysql/base.py", line 124, in execute

return self.cursor.execute(query, args)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py", line 220, in execute

self.errorhandler(self, exc, value)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler

raise errorvalue

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py", line 209, in execute

r = self._query(query)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py", line 371, in _query

rowcount = self._do_query(q)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py", line 335, in _do_query

db.query(q)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/connections.py", line 280, in query

_mysql.connection.query(self, query)

_mysql_exceptions.OperationalError: (1005, "Can't create table 'portal_aperture.#sql-403_b3' (errno: 150)")

The above exception was the direct cause of the following exception:

Traceback (most recent call last):

File "manage.py", line 10, in <module>

execute_from_command_line(sys.argv)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/core/management/init.py", line 338, in execute_from_command_line

utility.execute()

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/core/management/init.py", line 330, in execute

self.fetch_command(subcommand).run_from_argv(self.argv)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/core/management/base.py", line 393, in run_from_argv

self.execute(*args, cmd_options)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/core/management/base.py", line 444, in execute

output = self.handle(*args, options)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 179, in handle

created_models = self.sync_apps(connection, executor.loader.unmigrated_apps)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 317, in sync_apps

cursor.execute(statement)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/backends/utils.py", line 79, in execute

return super(CursorDebugWrapper, self).execute(sql, params)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/backends/utils.py", line 64, in execute

return self.cursor.execute(sql, params)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/utils.py", line 97, in exit

six.reraise(dj_exc_type, dj_exc_value, traceback)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/utils/six.py", line 658, in reraise

raise value.with_traceback(tb)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/backends/utils.py", line 62, in execute

return self.cursor.execute(sql)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/backends/mysql/base.py", line 124, in execute

return self.cursor.execute(query, args)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py", line 220, in execute

self.errorhandler(self, exc, value)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler

raise errorvalue

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py", line 209, in execute

r = self._query(query)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py", line 371, in _query

rowcount = self._do_query(q)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py", line 335, in _do_query

db.query(q)

File "/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/connections.py", line 280, in query

_mysql.connection.query(self, query)

django.db.utils.OperationalError: (1005, "Can't create table 'portal_aperture.#sql-403_b3' (errno: 150)")

Thanks.